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If a is the degree of dissociation of $Na_2SO_4$, the van?t Hoff factor (i) used for calculating the molecular mass is :
If a is the degree of dissociation of $Na_2SO_4$, the van?t Hoff factor (i) used for calculating the molecular mass is :
Updated On: Jul 28, 2023
- $1-2\alpha$
- $1+2\alpha$
- $1-\alpha$
- $1+\alpha$
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The Correct Option is B
Solution and Explanation
$Na_{2}SO_{4}\,{\rightleftharpoons}\,2Na^{+} + SO^{2-}_{4}$
van?t Hoff factor $i = \left[1 + \left(y - 1\right)\alpha\right]$
where $y$ is the number of ions from one mole solute, (in this case $= 3$), $\alpha$ the degree of dissociation.$\quad\quad i = \left(1 + 2\alpha\right)$
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Concepts Used:
Solutions
A solution is a homogeneous mixture of two or more components in which the particle size is smaller than 1 nm.
For example, salt and sugar is a good illustration of a solution. A solution can be categorized into several components.
Types of Solutions:
The solutions can be classified into three types:
- Solid Solutions - In these solutions, the solvent is in a Solid-state.
- Liquid Solutions- In these solutions, the solvent is in a Liquid state.
- Gaseous Solutions - In these solutions, the solvent is in a Gaseous state.
On the basis of the amount of solute dissolved in a solvent, solutions are divided into the following types:
- Unsaturated Solution- A solution in which more solute can be dissolved without raising the temperature of the solution is known as an unsaturated solution.
- Saturated Solution- A solution in which no solute can be dissolved after reaching a certain amount of temperature is known as an unsaturated saturated solution.
- Supersaturated Solution- A solution that contains more solute than the maximum amount at a certain temperature is known as a supersaturated solution.
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